Python函数不断返回空列表[[]，[]，[]]

ddarikpa 于 5个月前发布在 Python

关注(0)|答案(2)|浏览(52)

这可能有点明显，但我对python相对较新。
所以我尝试了一小段代码来打印一个列表，其中包含来自以下数据的每个子列表的最小字符串。

my_movies = [['How I Met Your Mother', 'Friends', 'Silicon Valley'],['Family Guy', 'South Park', 'Rick and Morty'],['Breaking Bad', 'GOT', 'The Wire', 'The Last of Us']]

字符串
令人惊讶的是，我得到了空列表作为输出。有人可以帮助我吗？

def min_length(my_movies):
    all_small_movies=[]
    minlen=2
    for movies in my_movies:
        if len(movies)<minlen:
            minlen=len(movies)
            all_small_movies=[movies]
    return all_small_movies
small_new_list=list(map(min_length,my_movies))

型

python

来源：https://stackoverflow.com/questions/77756287/python-function-keeps-returning-empty-list

2条答案

按热度按时间

dsekswqp1#

就像我提到的，这是minlen的初始化值的问题
这里是更新的代码

import sys

my_movies = [['How I Met Your Mother', 'Friends', 'Silicon Valley'],['Family Guy', 'South Park', 'Rick and Morty'],['Breaking Bad', 'GOT', 'The Wire', 'The Last of Us']]

def min_length(my_movies):
    all_small_movies=[]
    minlen=minlen=sys.maxsize
    for movies in my_movies:
        if len(movies)<minlen:
            minlen=len(movies)
            all_small_movies=[movies]
    return all_small_movies
small_new_list=list(map(min_length,my_movies))

print(small_new_list)

字符串
这里是输出